"It's an old human habit -- living off the road kill of the planet. There's evidence, for example, that early humans were engaged in scavenging before they figured out how to hunt for themselves. They'd scan the sky for circling vultures, dash off to the kill site -- hoping that the leopard that did the actual hunting had sauntered off for a nap -- and gobble up what remained of the prey. It was risky, but it beat doing your own antelope tracking.
"We continue our career as scavengers today, attracted not by vultures but by signs saying 'Safeway' or 'Giant'. Inside these sites, we find bits of dead animals wrapped neatly in plastic. The killing has already been done for us -- usually by underpaid immigrant workers rather than leopards."
-- Barbara Ehrenreich, "Liposuction: The Key to Energy Independence", 2008-06-23